 Root's book outlining his libertarian views, "The Conscience of a Libertarian", was published in 2009.On May 4, 2007, Root declared his candidacy for the Libertarian Party's 2008 presidential nomination.On May 25, 2008, Root advanced to the fifth ballot of the Libertarian Party presidential nomination vote at the 2008 Libertarian National Convention before being eliminated and endorsing Bob Barr, who became the party's presidential nomination.